lightpen for Sun Workstations

[Rui Zhao]

Recently, I'm doing some research work in gestural interface or paper like
interface. For making experiments I need a lightpen as input device for
drawing on the screen. 

Does anyone have informations about such things?  For PCs there are many
lightpen or digitizer products, by I've not seen any lightpen for Sun
Workstations (Sun 3/60 or Sparc). Graphical Tablet is not appropriate,
because I want draw on the screen. 

Any releted informations and hints are wellcome.

Rui Zhao -- Cadlab Bahnhofstr. 32   4790 Paderborn W.Germany
zhao%cadlab at uunet.uu.net        or    zhao at cadlab.uucp